2. Respiratory System ð Lungs ð Throat ð Passageways that lead to the lungs The respiratory system is made up of : Exchanges gases in the lungs.

3. Breathing Involves inhaling, exhaling, and gas exchange The parts of the respiratory system used in breathing include : 1. Nose and mouth - Where air enters and leaves the body. 2. Throat (pharynx) - Where air, food and drink travel. Branches into two tubes (one for air and one for food). 3. Voice box (larynx) - Air flow between vocal cords produces sound.

4. 4. Windpipe (trachea) - Tube that carries air from throat to lungs. 5. Bronchi - Trachea splits to form two tubes (one for each lung). 6. Lungs - Soft tissue where gas exchange occurs 7. Bronchioles - thousands of tiny tubes inside lungs 8. Alveoli - surrounded by capillaries. Exchanges carbon dioxide (CO 2 ) and oxygen (O 2 ).

5. Respiration ³ The entire process by which the body takes in and uses oxygen and removes carbon dioxide and water. Respiration takes place in two parts:  Breathing  Cellular Respiration

6. Voice box (Larynx) Wind pipe (Trachea) Lung Throat (Pharynx) Bronchi Bronchioles Alveoli Parts of the Respiratory System The diaphragm is the muscle under your lungs that allows the lungs to expand and contract. Diaphragm

7. April 28 th 1.Write down your homework: Page 9-15 in packet Flashcards for Circulatory and Respiratory 2.Get out your homework. 3.Quiz 3 will be Thursday. Circulatory and Respiratory systems

8. Your Lungs pg 9-14 bronchial tube right lung pleura bronchiole capillaries alveoli left lung trachea

9. How do we Breathe? The lungs do not contain muscles to move air in and out Rib muscles and the diaphragm are needed to move air in and out of the body. Inhaling: When we breathe in we take in oxygen. The diaphragm contracts and moves down (increasing chest volume) The rib muscles contract, the rib cage moves up. (air rushes in) Exhaling: When we exhale we release carbon dioxide. The diaphragm relaxes and moves up. (decreasing chest volume) The rib muscles relax, the rib cage moves down. (forcing air out)

10. Need for Oxygen Once the oxygen has reached the lungs, it needs to enter the blood stream. Why? Every cell in our body needs oxygen to make energy. Inside the alveoli, which are surrounded by capillaries, gases are exchanged between the lungs and the blood. Think back to the circulatory system.

11. Gas Exchange in Alveoli.  Oxygen leaves the alveoli (lungs) and enters the capillaries (red blood cells) to be transported throughout the body.  Carbon dioxide leaves the capillaries (red blood cells) and enters the alveoli (lungs) to be exhaled.

12. Gas Exchange in Alveoli It’s like the Raging River at The Great Escape! You are “dry” or oxygen molecules waiting to get on the ride. The tubes are red blood cells. To get on you have to wait for “wet” or carbon dioxide molecules to get off. Then you can enjoy the ride.

13. Why is the circulatory system important to the respiratory system? The circulatory system carries oxygen and carbon dioxide throughout the body. Oxygen is needed by cells to make energy (cellular respiration). Carbon dioxide is a waste product of cellular respiration that must be removed from the body.

14. Inhale Contracted diaphragm Breastbone Lung Spine Relaxed diaphragm Exhale Oxygen Carbon dioxide

15. 1. www.oup.co.uk/images/oxed/children/ yoes/humans/lungs.jpg 2. www.mamashealth.com/ images/lungs1.gif 3. www.scdhec.net/eqc/baq/ images/alveoli.jpg 4.http://users.tpg.com.au/users/amcgann/body/respiratory/alveoli.jpg 5. Human Body. Ann Baggaley (ed) Dorling Kindersley Publishing, Inc. New York:2001 Videos were obtained from www.unitedstreaming.com Resources for pictures and video: